Physics ยท General Awareness

Physics Measuring Instruments

1,123 Questions

Physics measuring instruments are essential tools used to measure various physical quantities. This topic covers devices like hygrometers, oscilloscopes, and sphygmomanometers. It is a highly scoring section in general science and general awareness examinations.

Pressure and humidity instrumentsElectrical measuring devicesMedical physics toolsNavigational instruments

Physics Measuring Instruments Questions

Multiple choice

Which of the following is NOT a common type of ceramic sensor?

  1. Thermistor

  2. Piezoelectric sensor

  3. Pyroelectric sensor

  4. Capacitive sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermistors are not ceramic sensors. They are semiconductor devices whose resistance changes with temperature.

Multiple choice

Which type of ceramic sensor is commonly used to measure temperature?

  1. Thermistor

  2. Piezoelectric sensor

  3. Pyroelectric sensor

  4. Capacitive sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermistors are ceramic sensors whose resistance changes with temperature, making them suitable for temperature measurement.

Multiple choice

Which underwater acoustic technique is used to measure the depth of water?

  1. Echo Sounding

  2. Side-scan Sonar

  3. Multibeam Sonar

  4. Doppler Sonar
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Echo sounding is a method that utilizes sound waves to determine the depth of water by measuring the time it takes for a sound pulse to travel to the seabed and back.

Multiple choice

What is the unit used to measure noise levels?

  1. Decibels (dB)

  2. Hertz (Hz)

  3. Pascals (Pa)

  4. Watts (W)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Noise levels are typically measured in decibels (dB), which represent the relative loudness of a sound compared to a reference level.

Multiple choice

Which instrument is commonly used to measure the water level in a hydropower reservoir?

  1. Pressure transducer

  2. Flow meter

  3. Level sensor

  4. Turbine speed sensor
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Level sensors, such as ultrasonic or float-based sensors, are typically used to measure the water level in a hydropower reservoir.

Multiple choice

Which type of flow meter is commonly used to measure the flow rate of water in a hydropower plant?

  1. Venturi meter

  2. Orifice plate

  3. Magnetic flow meter

  4. Ultrasonic flow meter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Venturi meters are commonly used to measure the flow rate of water in hydropower plants due to their accuracy and reliability.

Multiple choice

Which type of sensor is typically used to measure the vibration of a hydropower turbine?

  1. Accelerometer

  2. Strain gauge

  3. Temperature sensor

  4. Pressure transducer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Accelerometers are commonly used to measure the vibration of hydropower turbines, providing valuable information for condition monitoring and fault detection.

Multiple choice

Which type of instrument is commonly used to measure the temperature of a hydropower turbine bearing?

  1. Thermocouple

  2. Resistance temperature detector (RTD)

  3. Infrared thermometer

  4. Pressure transducer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Resistance temperature detectors (RTDs) are often used to measure the temperature of hydropower turbine bearings due to their accuracy and reliability.

Multiple choice

Which type of sensor is typically used to detect leaks in a hydropower plant's water pipes?

  1. Acoustic leak detector

  2. Flow meter

  3. Pressure transducer

  4. Temperature sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acoustic leak detectors are commonly used to detect leaks in hydropower plant's water pipes by identifying the sound generated by the escaping water.

Multiple choice

Which type of instrument is commonly used to measure the pressure of the water in a hydropower plant's penstock?

  1. Pressure transducer

  2. Flow meter

  3. Level sensor

  4. Turbine speed sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure transducers are typically used to measure the pressure of the water in a hydropower plant's penstock, providing information about the water flow and the overall performance of the plant.

Multiple choice

Which type of sensor is typically used to measure the humidity in a hydropower plant's control room?

  1. Hygrometer

  2. Flow meter

  3. Pressure transducer

  4. Temperature sensor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hygrometers are commonly used to measure the humidity in a hydropower plant's control room, ensuring that the environment is suitable for the sensitive electronic equipment.

Multiple choice

Which of the following is NOT a common type of pest monitoring device used in art collections?

  1. Sticky traps

  2. Light traps

  3. Temperature and humidity monitors

  4. Motion detectors
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Motion detectors are not typically used as pest monitoring devices in art collections.

Multiple choice

What is the Kelvin scale?

  1. A scale used to measure color temperature

  2. A scale used to measure exposure

  3. A scale used to measure focus

  4. A scale used to measure contrast
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Kelvin scale is a scale used to measure color temperature.

Multiple choice

How does a color temperature meter work?

  1. It measures the intensity of light emitted by a light source.

  2. It measures the wavelength of light emitted by a light source.

  3. It measures the frequency of light emitted by a light source.

  4. It measures the color temperature of a light source by comparing it to a known reference.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A color temperature meter works by measuring the color temperature of a light source by comparing it to a known reference. It typically uses a sensor that is sensitive to different wavelengths of light, and it calculates the color temperature based on the relative intensities of these wavelengths.

Multiple choice

What are some common types of color temperature meters?

  1. Contact color temperature meters

  2. Non-contact color temperature meters

  3. Spot color temperature meters

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are several types of color temperature meters available, including contact color temperature meters, non-contact color temperature meters, and spot color temperature meters. Contact color temperature meters are placed directly on the light source, while non-contact color temperature meters measure the color temperature from a distance. Spot color temperature meters measure the color temperature of a specific area within a scene.